Phys.org has short summary of research into patterns of fiber transfer across clothing during different types of assaults [phys.org]. The club members wore specially dyed uniforms and then enacted various styles of assault and defense to allow researchers to observe how clothing fibers transferred as a result.
Researchers from Northumbria University and King's College London have published findings outlining the extent that textile fibers transfer during controlled assault scenarios.
Their work, recently published in the academic journal Science & Justice, is the first time the number of fibers transferred between garments during physical assaults has been assessed by simulating the act with real people through Northumbria University's Jiu Jitsu club.
Apparently thousands of fibers were cross-transferred between the participants' garments each time, varying per attack/defense scenario.
Previously:
(2016) The Problems With DNA Evidence [soylentnews.org]
(2014) Forensic "Science" is Anything But [soylentnews.org]